Transmission gearing



p 1930- w. .A. MCCAR'RELL- 1,774,806 TRANSMISSION GEARING Filed Sept. 5, 1929 2 Sheets-Sheet 1] ATTORNEYS Sept. 2, 1930. w, A. MC ARRELL 1,774,806

TRANSMISSION GEARING Filed Sept. 3, 1929 2 Sheets-Sheet 2 NNNNNN OR ATTOFiuEY'S I. TRANsMrssIon GEAeIne Y Application filedisep ternber The invention relatesto transmission gearings designedyfornseon motor vehicles and has for itsfobj ect first the obtainingof .a con struction which has a plurality of quiet'runf '5 ning differential gear speedssuitabl'e foriise as alternatives-"to th'e directdrive second, to obtain the above described construction with a simple organization of mechanicalleleinents j that may be manufactured at relativelyjlow cost. Withthese objectszinview theanven tion f consists in the, novel iconstructiom' far rangement, and-combination of parts'as here inafter deS ribed' Q I '1 p In-thedrawingszyj 1 Figure 1 is a vert'c a'lcentral longitudinal section partly inelevation through. my im- I proved transmiss on; c Figure 2 a sacross 80013101} brokenaway -to show p'artsin,difierentiplanes substantially 1 on line 2-2 of'F-igure 1; j if Figur es 3 and. are cross sections respec V tively on-lines 3'-'-3 and 4440f. Figure As shown," 1 is the fraine Or case otthe transmission for supporting thebearings 2, 3,; i 4,,5carryingthe driving shaft 8, th'e'main. haft 9 andthe countershaftl'O. It also car- 7 lies the internal'gearj spool 11 on bearings '6 and? which arecarried upon cross supports cast integral ,with the case; The ,i1pper the form ota-cap 14 bolted to support iby screws or I in place andbored integralywith-thesupports v12, but aredetachable for assembly purposes. The caselalso carries bosses for' supporting the idler gearstud 16, the shifter rodsginterlocks, shifting lever; etcAThe driving shaft 8'is flanged up into a drum portion-17 which haveslots milled across and whichcarry the rolls in the rollerfelutches' as isfully described in my previous. Patents Nos; 1,380,917,

7 13945794 and 1,590,304., It also has an extension. 18 which is driven from corresponding slots fromjaws on drum portion of 17 This carrying the rolls 19 for engaging the third speed drive. a-roll retaining plate-20 isQprOVidedQanda this extensionjl8 and retaining plateQO are 50 fastened as a unit -to and'- driven bythe jaws e WIL AM A; mce eeemyoriseeem, m m ra; em inse emsqemiwtma crrmn communes; memo r, MICHIGAN, A; coerce-an on "on; ianonroan on th (1 m "pbrtipiiiii'ei il ikiriem igha itis understood that aroma a solid piece o v driverfromste1n8 toretaining PlateQO and;

v part of these hearing supports 12'aremade in studs 15. The caps 14L" arebolted:

7 extension 181s also provided;withvjaws for At the end of the extension 18 3, 1929. S eriali'No 916,131."

, carries therollsj19 {for driving Ith e' and direct speeds f Themain shaft 9=isisplined at its andcarriesadog ormainshaftgdri'ver-upo tion 21, made as a lO-QSe; pieoelfor-assenibly with recesseson splines onits outer periphery iforrn "of cl'utch'thiat may beused. Thimain purposes Thisdriver; orfd'oggis; provided Y 7 for, receiving thedrivinggrolls 19 oryother shaftg9 carries. the internal- ;gear; driver 1 2:2, i

V which is a free running fitupon main h 'fi v 'I -he' driver. :22 is provi'dedwith recesses V 7 2310111 its hub portion. for engagementwith' the rolls 19 for-driving third speed.

; Theinternal gear spool 11 doweled and bolted togetherby meansof the screws 24;.- This. spool has the i external gear;

"rear internal gearv-26 The internal gear ismade'as a separate piecefrom spool 11 to "allow for grinding the teeth or other finish {after hardening,rand is afterward pressed in and keyed 'p o become a integral part;

of the spool 11.; The rear 1 internal, gear driver 28 is made asa separate gear and keyed J and pre'ssed on thespool after bearing 18111 1 thusallowingthe use of a smaller bear o The 'mainfi shaft 9 'carries'thedriven, s s H place, t nsi. e

member 29 in which the internal gear 126 is placed. This internal gear is madeas a sepa? rate piece so, that the teeth maybe ground- P cry-otherwise finished afterflhardening, o -;Mounted on. the hub oflthis main shaft -v drive '29 is thespiralgear 3O which is the driven member for lsecond speedfand, thegp; 7 whole unit comprised-of driven-members '26; 29' and 30 is keyed jto the main shaft 9'to drive same, This. method out-mounting gear 30 on 3 I r l i 7 drive" gear while the part 32 isiany standard one [.Theniain shaiftl') isY journaledf v into drive shai 't 8' and isasuppo'rted on; its front, endlo y means of -bea'ring 33 fthus1propart29 allows shorter construction. 3

' The'part- 31 isthe'us ual: speed meter versal flange.

drive gear 35' for driving countershaft 10.

,The countershaft driving gearis made of V vsuch a helical angle that the thrust is'carried against I bearingi, therefore the thrust on countershaft driven gear 35 must'be'in the v 10 i i r. thrustvagainst bearing 5, therefore the thrust "oncountershaft' second speed gear 36'must be in the opposite direction sothat the thrusts opposif direction. As ."the tooth angle on second" speed gear is "made to carry the j-ofthe countershaft gears--35 and 36 oppose each otherffor balance, and any excess thrust 1s carried on bear1ngs2'and3. The gear 351s made as a separate piece, and 1s v keyed to fcountershaft .Countershaft 10' is providedwithsp'lines 37;.through part of its "length to engage with internal splines38 in combination first speed driver gear 39, and

clutch portion 40. to' drive same. It is also provided "with cylindrical" portion ll upon which: the second "speed gear 36 vis guided between shoulders 42 and43, and upon which it is free to rotate whennot'in engagement for driving.

The combination first, reverse andsecond speed driver is provided with'teeth lstaggered clutch teeth 45 and; groove 46 for engagement with shifterfork 4.7. The free running countersihaft' gear 36 has staggered external clutchteeth 4.8"provided on'its' hub I for fldrivingengagement with. combination gear and clutch j member 39, The reverse idler gear 49 is free to rotate on'the idler shaft 16 and isalsoslidable back and forward on 'said shaft 16 by means of alreverse shifter With teeth on 390 111 and'combination gear fork operating in groove 50; This gear is I 40* in constant engagement with combination gear-e39, and free to rotate with same as well as slidableback and forth for engagement ,The transmission maybe provided with any'suitable shifter mechanism including a plurality of'shifter rods or slides to which the several shifter rods are connected; However, as this mechanism forms no part of the present invention, specific description of the same is 0I111tt6dy; I f

' Withthe construction as above.described the operation is asfollows: Wheneverthe driving shaft Sis running the countershaft will also bedriven through the medium of the constant mesh spiral-gear train 34 and 35.. Thegeargwheel 391011, the counter shaft 1OJand the reverse idler gear l9will (also be [driven but inthe position of parts shown in F gure 1" neitherof thesegears are n mesh with the driven train. Therefore the main or driven shaft 9 remains stationary.

To establish first or emergency forward a 4 drive thegear wheel 39 isishifted by the operation of the fork l7 so asto be meshed with the gear wheel which willthus communicate motion to this gear wheel and through the gear wheel 28 and internal gear wheel 26 Will communicate low speed forward motion to the main shaft 9. To establish reverse the gear wheel 29 is shifted into the position showninFigure 1 and the idler gear 49 is shifted by the fork operating in the groove 50 so as to mesh the same with the gear wheel 25 while still retaining the intermeshing engement with the gear wheel 39. This will drive the main shaft 9 at the same speed but in reverse direction. To establish second speed forward the gear wheel 39 with its clutch portion is shifted in the reverse directionifrom that before described which causes theclutch teeth to engage with the clutch teethS on the cylindrical'portion 4-1 of the gear 36. This will rotatively couple the countershaft 10 to the gear wheel 36 which through the constant mesh spiral geartrains 36 and 30 will drive the shaft9. 'As these constant mesh gear trains 34, 35, 36' and30 are spiral or helical gears, they will be quiet running if the speed of operation is not greater than to produce a vehicle speed of twenty-five miles per hour.

To establish third speed forward the gear wheel 39 is returned to the position shown in Figural and the drive shaft 8 is clutched to the internal gear driver 22. This is accomplished bythe sliding of a collar 51 sleeved on the drum 1'? to the right as shown in Figure 1 which depresses the rolls 19 intothe recesses 23 on thehub of the driver 22 and thereby directly couples the shaft, to the driver. As the external gear on the driver 22 is in constant mesh with the internal 27 on the spool 11, this spool will be driven V and through the medium of the gear wheel 28 and internal gear wheel 26 will drive the shaft 9. This third speed forward may be used for driving the vehicle at desired speed and will be quiet in its operation.

Finally, to establish direct drive the collar 51 is moved upon the drum 17 in the reverse direction so as to'depress the rollers 19 into the splines of the dog or main shaft driver 21 thereby coupling the shafts 8 and 9; 7

What I claim as my invention is:

1. In ajtransmission gearing, the combination of axially aligned drive and driven shafts having'a journaled en agement with each other, a peripheral clutch member on said driven shaft adjacent to said drive shaft, a memberrotatively mounted on said driven shaft having a peripheral clutch portion adjacent to the clutch portion on said driven shaft, an internal gear reduction train between said rotatively mounted member and said driven shaft, a sleeve on'said drive shaft surrounding the peripheral clutch portion said driven shaft and'said rotatively mount ed member, roller clutches carried iy saic sleeve member for respectively engaging said I, 20 p v I I c taining intermeshingi engagement with said peripheral clutch members and a shiftable member for alternativelyengaging said roller clutches;to effect a clutching between said drive shaft directly t s-aiddriven shaft or indirectly through the medium 0f said tion with a driveshaft, an axially aligned driven shaft, a; parallel 'countersha-fh-a constant mesh gear train between saiddrlve shaft andcounter shaft,-agear surrounding said drivenshaft fqrming a member'ofa train connected thereto, a gear slida'bleupon and splined to said counter .shaft shiftable into engagement with said last; mentioned gear, anidler gear ln'constant mesh'wlthsaid tobe alternativelyengaged by said counter v formed on V flanges, 1ournal bearings in said casing eccounter shaft gear and means forshifting.

said idler gear intomesh .withthe said gear surrounding said'drlvenshaft -w-h le malngear on the counter shaft. r

3. In a .transmissiongearing, the combina-" tion ofa drive shaftfan axially: aligned driven shaft, a parallel counter shaft, aco-n-Qj stant mesh gear train between s'aidl drive shaft and counter shaft, a'shiftable gear on said counter shaft, a shiftable'idler gear in constant mesh with said" counter V shaft, gear and a single gear forming a member of. a}

train connected to saidd'riven shaft adaptedv shaft gearand said idler gear;

' 4. In a transmission mechanism, the'com bination ofa drive shaft, an axially aligned driven shaft having a journ'alled engagement with saiddrive shaft, a peripheral splineportion'of said driven shaft adjacent said drive shaft, a member rotativelymounted on said; driven shaft having a peripheral splined" portion adjacent to the spline portion of said driven shaft, a reduction gear'trainbetween .said rotativememberand said driven shaft, a sleeve extending from saiddrive shaft to surround the spline portions of said driven shaft and rotatively mounted me'mber, clutch rollers engaginglongitudlnal slots insald sleeve and surrounding respectlvely, sald spline portions, and a 'shiftable sleeve nor mally intermediate said clutch-rollersadapt ed when moved in oppositedirections tofforce said rolls into engagement with said splines- 'to alternatively couple: said drive shaft directly to said driven shaft or "to said rota five member. 7 V I v 5. In a transmission gearing, the combination with'a casing and a shaft .journaled therein, of a spool member surrounding said shaft comprising abutting sections, an internal ring gear securedbetweenisaid abutting sections, and journal bearings in said'casing eccentric to the axis of said shaft forexter nally engaging said spool member on opposite sides of said ring gear.

6. In a transmission gearlng, the combination: with l a casing and a shaft 'journaled thereim-ofa spool member surrounding said shaft comprising-abutting flanged sections, F ans internal :rin-g? gear secured between. the

tion with a casing'and/fa-i shaft journaled'f therein, of a spool member surrounding said shaftcomprising abutting flanged sections form ng atrecess,;a1 1 internal ring gear en gaging said'recess and clamped between said flangecllsectionsfan extern'alg'ear wheel 'on bearings in'said casing eccentric to the axis of-fsaid shaft and externally engaging said spool on "opposite sides of saidabutting flanges and an external ring gear detachably engaging one of said sections on the outer, 'side of the'journal'bearing therefor.

8. Ina transmisison gearlng,

theperiphery of one ofsaid flanges, journal: I

the combina 11 I tion with'a casing-and alsha'ft 'ourna le'd engaging-r said recess and clamped ,between' I said abigtting flanges, an external gear the periphery of one of said centric to said shaft engaging said spool therein, of a gear member rotatively sleeved; upon said shaft, aspool member surrounding? said shaft comprising'abutting} flanged sec- I tion's forming'are cess, an internal ring gear member on opposite sides of'said abutting I v flanges and holding said internal gear in mesh with the gear sleeved upon said, shaft,

an external gear detachably engaging one of said sections on the outer side of the journal bearing thereforfan internal gear wheel secured to said shaft and lntermeshing w1th said externalgear wheel and means for alternatively driving said shaft directly or through said gear train.

9. In a transmission gearing, the combination of a'drivelshaft, an ex'ternally aligneddriven sha'ft, a parallel counter shaft, a; constant mesh gear; train between said 1 drive shaft and saidcounter shaft, a gear rotatively sleeved on said driven shaft, means for al ternatively clutching said drive shaft directlvwith said' driven shaft or with said sleeve v gear, a spool membersurrounding said driven shaft and sleeve gear comprlsing abutting flanged'sections, an'internal ring gear engag ing a recess in and secured between said abutting flang'edsections, ane'xternal gearvon the periphery of one of the abutting flanges, a

casing in which said shafts'are journaled,

journalbearings in said casing eccentric to said driven shaft and externally engaging c said spool on opposite sides 'ofsaid abutting flanges to hold said internal ring gear in'mesh with the gear sleeved on said drivenshaft,

anexternal gear of greater diameter than one of said" journal bearings detachably mounted on said spool outside of said bearings, an internal gear Wheel mounted on said I driven shaftrancl in mesh with saicl'last men'- tionecl external'gear, and a gear on said counter shaft shiftable to mesh with" the external gear on said flange Wherebvthree differential trainsmav be alternatively established between said drive shaft and driven shaft .111 a transmission mechanism; an internal gear'spool comprising abutting flange sections, an lnternal ring gear clamped be- 5 tween the abutting flanges and an external r ng gear mounted on one of said sections.

' In testimony whereof I aifix my signature. WILLIAM A; MGOARRELLQ 

